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en.wikipedia.org/wiki/Illumination_(lighting)

Lighting or illumination is the deliberate use of light to achieve a practical or aesthetic effect. Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylight. Daylighting (using windows, skylights, or light shelves) is sometimes used as the main source of light during daytime in buildings.

mysite.du.edu/~jcalvert/optics/lumens.htm

However, illumination is not only of considerable practical importance, but its definitions and methods are applicable to the transfer of any kind of radiant energy. The strange units of illumination may be regarded askance, but a basic unit, the candela, is a fundamental unit of the SI system.

www.atp-instrumentation.co.uk/blog/how-to-measure-light-levels

My main goal is to measure how much light is hitting a person’s eye in a given condition. Is it most appropriate to measure candela/m2 or lux in this case? I have found so many conflicting points about the differences between luminance and illumination, regarding which is more appropriate for my purposes.

www.thefreedictionary.com/illumination+unit

Define illumination unit. illumination unit synonyms, illumination unit pronunciation, illumination unit translation, English dictionary definition of illumination unit. ... Noun 1. illumination unit - a measure of illumination light unit - a measure of the visible electromagnetic radiation footcandle - a unit of illuminance on... Illumination ...

www.britannica.com/science/lux

Lux: Lux, unit of illumination (see luminous intensity) in the International System of Units (SI). One lux (Latin for “light”) is the amount of illumination provided when one lumen is evenly distributed over an area of one square metre. This is also equivalent to the illumination that would exist on a

smartvisionlights.com/blog/understanding-illumination-and-light-measurement

This can be measured in candelas/square meter (cds/m 2) or foot-lamberts (fLs). Illuminance, on the other hand, describes the measurement of the amount of light illuminating the surface area and is measured in lux or foot-candles and correlates with how humans perceive the brightness of illuminated areas.

www.answers.com/Q/What_unit_is_illumination_measured_in

Illumination is usually measured in foot candles, lux or lumens. Foot candles are measured one foot from the light source, whereas lumens are measured at a distance of one square meter.

www.axis.com/files/tech_notes/Axis_MMI.pdf

Illumination is measured in the centre of the charts as close as possible to and parallel to the chart plane. Adjust the camera so that the charts fill the image. 3. The total exposure time shall not exceed 200 ms, for any type of exposure or frame integration. 4. Ensure the focus on the charts is kept stable.

en.wikipedia.org/wiki/Illuminance

In photometry, illuminance is the total luminous flux incident on a surface, per unit area.It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. Luminous emittance is also known as luminous exitance.

sciencing.com/do-measure-lux-lighting-6903072.html

Where lumens measure the amount of light a light source emits, lux tells how much that light source illuminates an object or workspace that is one square meter in area and placed one meter away from the light source. Lux meters, or light meters, determine the amount of available light in either luxes or in ...